Magnetic base body, coil component including the magnetic base body, circuit board including the coil component, and electronic device including the circuit board

Abstract

A magnetic base body according to one embodiment includes: a plurality of soft magnetic metal particles; and a plurality of insulating films covering surfaces of the plurality of soft magnetic metal particles. The plurality of soft magnetic metal particles include a first soft magnetic metal particle, and the plurality of insulating films include a first insulating film covering a surface of the first soft magnetic metal particle. The first insulating film includes one or more first oxide regions, the one or more first oxide regions containing Fe and Cr and having a peak intensity at 730 cm−1 in a Raman spectrum obtained by Raman spectrometry.

What is claimed is: 
     
         1 . A magnetic base body comprising:
 a plurality of soft magnetic metal particles; and   a plurality of insulating films covering surfaces of the plurality of soft magnetic metal particles,   wherein the plurality of soft magnetic metal particles include a first soft magnetic metal particle,   wherein the plurality of insulating films include a first insulating film covering a surface of the first soft magnetic metal particle, and   wherein the first insulating film includes one or more first oxide regions, the one or more first oxide regions containing Fe and Cr and having a peak intensity at 730 cm −1  in a Raman spectrum obtained by Raman spectrometry.   
     
     
         2 . The magnetic base body of  claim 1 , wherein the peak intensity at 730 cm −1  in the Raman spectrum obtained by Raman spectrometry in the one or more first oxide regions is higher than a peak intensity at 680 cm −1  in the Raman spectrum obtained by Raman spectrometry in the one or more first oxide regions. 
     
     
         3 . The magnetic base body of  claim 1 , wherein the peak intensity at 730 cm −1  in the Raman spectrum obtained by Raman spectrometry in the one or more first oxide regions is higher than a peak intensity at 300 cm −1  in the Raman spectrum obtained by Raman spectrometry in the one or more first oxide regions. 
     
     
         4 . The magnetic base body of  claim 1 , wherein the one or more first oxide regions are spaced apart from the surface of the first soft magnetic metal particle. 
     
     
         5 . The magnetic base body of  claim 1 ,
 wherein the first insulating film includes a plurality of first oxide regions, the plurality of first oxide regions containing Fe and Cr and having a peak intensity at 730 cm −1  in a Raman spectrum obtained by Raman spectrometry, and   wherein the plurality of first oxide regions are spaced apart from each other.   
     
     
         6 . The magnetic base body of  claim 4 , wherein the plurality of first oxide regions are spaced apart from each other in a circumferential direction around a geometric center of the first soft magnetic metal particle. 
     
     
         7 . The magnetic base body of  claim 1 ,
 wherein the plurality of soft magnetic metal particles include a second soft magnetic metal particle and a third soft magnetic metal particle, the second soft magnetic metal particle being adjacent to the first soft magnetic metal particle, the third soft magnetic metal particle being adjacent to the first and second soft magnetic metal particles, and   wherein at least a part of a gap present among the first soft magnetic metal particle, the second soft magnetic metal particle, and the third soft magnetic metal particle is defined by the one or more first oxide regions.   
     
     
         8 . The magnetic base body of  claim 1 , wherein the first insulating film further includes one or more second oxide regions and one or more third oxide regions, the one or more second oxide regions containing an oxide of an element A as a main component and covering a first surface region constituting a part of the surface of the first soft magnetic metal particle, the one or more third oxide regions containing an oxide of an element B as a main component and covering a second surface region of the first soft magnetic metal particle different from the first surface region. 
     
     
         9 . The magnetic base body of  claim 8 , wherein the one or more first oxide regions are located on a radially outer side of the one or more second oxide regions. 
     
     
         10 . The magnetic base body of  claim 1 , wherein each of the plurality of soft magnetic metal particles contains Fe and Si. 
     
     
         11 . The magnetic base body of  claim 10 , wherein a content percentage of Fe in each of the plurality of soft magnetic metal particles is 95 wt % or more. 
     
     
         12 . The magnetic base body of  claim 8 ,
 wherein the element B is more apt to oxidation than Fe, and   wherein the element A is more apt to oxidation than the element B.   
     
     
         13 . The magnetic base body of  claim 12 ,
 wherein the element A is Al, and   wherein the element B is Si.   
     
     
         14 . A coil component comprising:
 the magnetic base body of  claim 1 , and   a coil conductor provided in the magnetic base body.